10-K Filing

Northwest Natural Holding Co CIK: 1733998 FY 2021

Filing Information

Form Type	10-K
Accession Number	`0001733998-22-000005`
Period End Date	20211231
Filing Date	20220225
Fiscal Year	2021
Fiscal Period	FY
XBRL Instance	nwn-20211231_htm.xml

Filing Contents

This filing contains the following financial statements:

Balance Sheet 102 Income Statement 90 Cash Flow Statement 143 Stockholders Equity 26

Balance Sheet 102 line items

Line Item	Tag	Value	Unit	Period
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$30.17M	USD	Point-in-time
Cash and cash equivalents	`CashAndCashEquivalentsAtCarryingValue`	$18.56M	USD	Point-in-time
Accounts receivable	`AccountsReceivableGrossCurrent`	$88.08M	USD	Point-in-time
Accounts receivable	`AccountsReceivableGrossCurrent`	$101.50M	USD	Point-in-time
Accrued unbilled revenue	`UnbilledReceivablesCurrent`	$57.95M	USD	Point-in-time
Accrued unbilled revenue	`UnbilledReceivablesCurrent`	$82.17M	USD	Point-in-time
Allowance for uncollectible accounts	`AllowanceForDoubtfulAccountsReceivableCurrent`	$2.02M	USD	Point-in-time
Allowance for uncollectible accounts	`AllowanceForDoubtfulAccountsReceivableCurrent`	$673.00K	USD	Point-in-time
Allowance for uncollectible accounts	`AllowanceForDoubtfulAccountsReceivableCurrent`	$3.22M	USD	Point-in-time
Allowance for uncollectible accounts	`AllowanceForDoubtfulAccountsReceivableCurrent`	$977.00K	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsCurrent`	$31.75M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsCurrent`	$72.39M	USD	Point-in-time
Derivative instruments	`DerivativeAssetsCurrent`	$13.68M	USD	Point-in-time
Derivative instruments	`DerivativeAssetsCurrent`	$48.13M	USD	Point-in-time
Inventories	`PublicUtilitiesInventory`	$57.26M	USD	Point-in-time
Inventories	`PublicUtilitiesInventory`	$42.69M	USD	Point-in-time
Income taxes receivable	`IncomeTaxesReceivable`	-	USD	Point-in-time
Income taxes receivable	`IncomeTaxesReceivable`	$6.00M	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$56.15M	USD	Point-in-time
Other current assets	`OtherAssetsCurrent`	$59.29M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$437.28M	USD	Point-in-time
Total current assets	`AssetsCurrent`	$323.25M	USD	Point-in-time
Property, plant, and equipment	`PropertyPlantAndEquipmentGross`	$3.73B	USD	Point-in-time
Property, plant, and equipment	`PropertyPlantAndEquipmentGross`	$4.00B	USD	Point-in-time
Less: Accumulated depreciation	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$1.08B	USD	Point-in-time
Less: Accumulated depreciation	`AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment`	$1.13B	USD	Point-in-time
Total property, plant, and equipment, net	`PropertyPlantAndEquipmentNet`	$2.65B	USD	Point-in-time
Total property, plant, and equipment, net	`PropertyPlantAndEquipmentNet`	$2.87B	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$348.93M	USD	Point-in-time
Regulatory assets	`RegulatoryAssetsNoncurrent`	$314.58M	USD	Point-in-time
Derivative instruments	`DerivativeAssetsNoncurrent`	$10.73M	USD	Point-in-time
Derivative instruments	`DerivativeAssetsNoncurrent`	$6.13M	USD	Point-in-time
Other investments	`OtherLongTermInvestments`	$89.28M	USD	Point-in-time
Other investments	`OtherLongTermInvestments`	$83.74M	USD	Point-in-time
Operating lease right of use asset	`OperatingLeaseRightOfUseAsset`	$77.45M	USD	Point-in-time
Operating lease right of use asset	`OperatingLeaseRightOfUseAsset`	$75.05M	USD	Point-in-time
Assets under sales-type leases	`NetInvestmentInLeaseNoncurrent`	$139.00M	USD	Point-in-time
Assets under sales-type leases	`NetInvestmentInLeaseNoncurrent`	$143.76M	USD	Point-in-time
Goodwill	`Goodwill`	$70.57M	USD	Point-in-time
Goodwill	`Goodwill`	$69.22M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$56.76M	USD	Point-in-time
Other non-current assets	`OtherAssetsNoncurrent`	$49.13M	USD	Point-in-time
Total non-current assets	`AssetsNoncurrent`	$3.43B	USD	Point-in-time
Total non-current assets	`AssetsNoncurrent`	$3.63B	USD	Point-in-time
Total assets	`Assets`	$4.06B	USD	Point-in-time
Total assets	`Assets`	$3.76B	USD	Point-in-time
Short-term debt	`ShortTermBorrowings`	$389.50M	USD	Point-in-time
Short-term debt	`ShortTermBorrowings`	$304.52M	USD	Point-in-time
Current maturities of long-term debt	`LongTermDebtCurrent`	$95.34M	USD	Point-in-time
Current maturities of long-term debt	`LongTermDebtCurrent`	$345.00K	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$97.97M	USD	Point-in-time
Accounts payable	`AccountsPayableCurrent`	$133.49M	USD	Point-in-time
Taxes accrued	`AccruedIncomeTaxesCurrent`	$15.52M	USD	Point-in-time
Taxes accrued	`AccruedIncomeTaxesCurrent`	$13.81M	USD	Point-in-time
Interest accrued	`InterestPayableCurrent`	$7.44M	USD	Point-in-time
Interest accrued	`InterestPayableCurrent`	$7.50M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityCurrent`	$112.28M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityCurrent`	$50.36M	USD	Point-in-time
Derivative instruments	`DerivativeLiabilitiesCurrent`	$10.40M	USD	Point-in-time
Derivative instruments	`DerivativeLiabilitiesCurrent`	$4.20M	USD	Point-in-time
Operating lease liabilities	`OperatingLeaseLiabilityCurrent`	$1.30M	USD	Point-in-time
Operating lease liabilities	`OperatingLeaseLiabilityCurrent`	$1.10M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$54.43M	USD	Point-in-time
Other current liabilities	`OtherLiabilitiesCurrent`	$52.33M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$627.08M	USD	Point-in-time
Total current liabilities	`LiabilitiesCurrent`	$724.76M	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$1.04B	USD	Point-in-time
Long-term debt	`LongTermDebtNoncurrent`	$860.08M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$658.33M	USD	Point-in-time
Regulatory liabilities	`RegulatoryLiabilityNoncurrent`	$639.66M	USD	Point-in-time
Pension and other postretirement benefit liabilities	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$166.68M	USD	Point-in-time
Pension and other postretirement benefit liabilities	`PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent`	$217.29M	USD	Point-in-time
Derivative instruments	`DerivativeLiabilitiesNoncurrent`	$2.85M	USD	Point-in-time
Derivative instruments	`DerivativeLiabilitiesNoncurrent`	$412.00K	USD	Point-in-time
Operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$80.62M	USD	Point-in-time
Operating lease liabilities	`OperatingLeaseLiabilityNoncurrent`	$79.47M	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$120.77M	USD	Point-in-time
Other non-current liabilities	`OtherLiabilitiesNoncurrent`	$114.98M	USD	Point-in-time
Total deferred credits and other non-current liabilities	`DeferredCreditsAndOtherLiabilitiesNoncurrent`	$1.38B	USD	Point-in-time
Total deferred credits and other non-current liabilities	`DeferredCreditsAndOtherLiabilitiesNoncurrent`	$1.36B	USD	Point-in-time
Commitments and contingencies (see Note 16 and Note 17)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Commitments and contingencies (see Note 16 and Note 17)	`CommitmentsAndContingencies`	-	USD	Point-in-time
Common stock - no par value	`CommonStockValue`	$590.77M	USD	Point-in-time
Common stock - no par value	`CommonStockValue`	$565.11M	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$355.78M	USD	Point-in-time
Retained earnings	`RetainedEarningsAccumulatedDeficit`	$336.52M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-12.90M	USD	Point-in-time
Accumulated other comprehensive loss	`AccumulatedOtherComprehensiveIncomeLossNetOfTax`	$-11.40M	USD	Point-in-time
Total equity	`StockholdersEquity`	$935.15M	USD	Point-in-time
Total equity	`StockholdersEquity`	$888.73M	USD	Point-in-time
Total liabilities and equity	`LiabilitiesAndStockholdersEquity`	$3.76B	USD	Point-in-time
Total liabilities and equity	`LiabilitiesAndStockholdersEquity`	$4.06B	USD	Point-in-time
Par Value (in dollars per share)	`CommonStockNoParValue`	-	USD	Point-in-time
Par Value (in dollars per share)	`CommonStockNoParValue`	-	USD	Point-in-time
Shares Authorized (in shares)	`CommonStockSharesAuthorized`	100.00M	shares	Point-in-time
Shares Authorized (in shares)	`CommonStockSharesAuthorized`	100.00M	shares	Point-in-time
Shares issued (in shares)	`CommonStockSharesIssued`	30.59M	shares	Point-in-time
Shares issued (in shares)	`CommonStockSharesIssued`	31.13M	shares	Point-in-time
Shares outstanding (in shares)	`CommonStockSharesOutstanding`	30.59M	shares	Point-in-time
Shares outstanding (in shares)	`CommonStockSharesOutstanding`	31.13M	shares	Point-in-time
Deferred Income Tax Liabilities, Net	`DeferredIncomeTaxLiabilitiesNet`	$319.29M	USD	Point-in-time
Deferred Income Tax Liabilities, Net	`DeferredIncomeTaxLiabilitiesNet`	$340.23M	USD	Point-in-time

Income Statement 90 line items

Line Item	Tag	Value	Unit	Period
Operating revenues	`Revenues`	$860.40M	USD	Annual
Operating revenues	`Revenues`	$746.37M	USD	Annual
Operating revenues	`Revenues`	$773.68M	USD	Annual
Cost of gas	`UtilitiesOperatingExpenseGasAndPetroleumPurchased`	$262.75M	USD	Annual
Cost of gas	`UtilitiesOperatingExpenseGasAndPetroleumPurchased`	$292.31M	USD	Annual
Cost of gas	`UtilitiesOperatingExpenseGasAndPetroleumPurchased`	$254.91M	USD	Annual
Operations and maintenance	`OperatingCostsAndExpenses`	$204.23M	USD	Annual
Operations and maintenance	`OperatingCostsAndExpenses`	$180.13M	USD	Annual
Operations and maintenance	`OperatingCostsAndExpenses`	$178.19M	USD	Annual
Environmental remediation	`EnvironmentalRemediationExpense`	$12.34M	USD	Annual
Environmental remediation	`EnvironmentalRemediationExpense`	$9.94M	USD	Annual
Environmental remediation	`EnvironmentalRemediationExpense`	$9.69M	USD	Annual
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$32.39M	USD	Annual
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$38.63M	USD	Annual
General taxes	`TaxesExcludingIncomeAndExciseTaxes`	$35.08M	USD	Annual
Depreciation and amortization	`DepreciationAndAmortization`	$91.50M	USD	Annual
Depreciation and amortization	`DepreciationAndAmortization`	$103.68M	USD	Annual
Depreciation and amortization	`DepreciationAndAmortization`	$113.53M	USD	Annual
Other operating expenses	`OtherCostAndExpenseOperating`	$3.90M	USD	Annual
Other operating expenses	`OtherCostAndExpenseOperating`	$3.70M	USD	Annual
Other operating expenses	`OtherCostAndExpenseOperating`	$3.25M	USD	Annual
Total operating expenses	`OperatingExpenses`	$697.28M	USD	Annual
Total operating expenses	`OperatingExpenses`	$625.33M	USD	Annual
Total operating expenses	`OperatingExpenses`	$602.90M	USD	Annual
Income from operations	`OperatingIncomeLoss`	$143.47M	USD	Annual
Income from operations	`OperatingIncomeLoss`	$148.35M	USD	Annual
Income from operations	`OperatingIncomeLoss`	$163.12M	USD	Annual
Other income (expense), net	`OtherNonoperatingIncomeExpense`	$-12.56M	USD	Annual
Other income (expense), net	`OtherNonoperatingIncomeExpense`	$-22.84M	USD	Annual
Other income (expense), net	`OtherNonoperatingIncomeExpense`	$-13.94M	USD	Annual
Interest expense, net	`InterestIncomeExpenseNonoperatingNet`	$-44.49M	USD	Annual
Interest expense, net	`InterestIncomeExpenseNonoperatingNet`	$-43.05M	USD	Annual
Interest expense, net	`InterestIncomeExpenseNonoperatingNet`	$-42.69M	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$91.36M	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$77.95M	USD	Annual
Income before income taxes	`IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest`	$106.07M	USD	Annual
Income tax expense	`IncomeTaxExpenseBenefit`	$27.41M	USD	Annual
Income tax expense	`IncomeTaxExpenseBenefit`	$21.08M	USD	Annual
Income tax expense	`IncomeTaxExpenseBenefit`	$12.64M	USD	Annual
Net income from continuing operations	`IncomeLossFromContinuingOperations`	$78.67M	USD	Annual
Net income from continuing operations	`IncomeLossFromContinuingOperations`	$65.31M	USD	Annual
Net income from continuing operations	`IncomeLossFromContinuingOperations`	$70.27M	USD	Annual
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$6.51M	USD	Annual
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	$-3.58M	USD	Annual
Income (loss) from discontinued operations, net of tax	`IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity`	-	USD	Annual
Net income	`NetIncomeLoss`	$78.67M	USD	Annual
Net income	`NetIncomeLoss`	$76.78M	USD	Annual
Net income	`NetIncomeLoss`	$61.73M	USD	Annual
Change in employee benefit plan liability, net of taxes	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$-2.65M	USD	Annual
Change in employee benefit plan liability, net of taxes	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$-2.85M	USD	Annual
Change in employee benefit plan liability, net of taxes	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax`	$593.00K	USD	Annual
Amortization of non-qualified employee benefit plan liability, net of taxes	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax`	$905.00K	USD	Annual
Amortization of non-qualified employee benefit plan liability, net of taxes	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax`	$476.00K	USD	Annual
Amortization of non-qualified employee benefit plan liability, net of taxes	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansNetOfTax`	$679.00K	USD	Annual
Comprehensive income	`ComprehensiveIncomeNetOfTax`	$74.61M	USD	Annual
Comprehensive income	`ComprehensiveIncomeNetOfTax`	$59.56M	USD	Annual
Comprehensive income	`ComprehensiveIncomeNetOfTax`	$80.16M	USD	Annual
Change in employee benefit plan liability, taxes	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	$-219.00	USD	Annual
Change in employee benefit plan liability, taxes	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	$1.02K	USD	Annual
Change in employee benefit plan liability, taxes	`OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax`	$956.00	USD	Annual
Amortization of non-qualified employee benefit plan liability, taxes	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax`	$-172.00	USD	Annual
Amortization of non-qualified employee benefit plan liability, taxes	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax`	$-320.00	USD	Annual
Amortization of non-qualified employee benefit plan liability, taxes	`OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax`	$-244.00	USD	Annual
Basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	30.54M	shares	Annual
Basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	29.79M	shares	Annual
Basic (in shares)	`WeightedAverageNumberOfSharesOutstandingBasic`	30.70M	shares	Annual
Diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	29.86M	shares	Annual
Diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	30.75M	shares	Annual
Diluted (in shares)	`WeightedAverageNumberOfDilutedSharesOutstanding`	30.60M	shares	Annual
Basic (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$2.56	USD	Annual
Basic (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$2.19	USD	Annual
Basic (in dollars per share)	`IncomeLossFromContinuingOperationsPerBasicShare`	$2.30	USD	Annual
Diluted (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$2.30	USD	Annual
Diluted (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$2.19	USD	Annual
Diluted (in dollars per share)	`IncomeLossFromContinuingOperationsPerDilutedShare`	$2.56	USD	Annual
Basic (in dollars per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare`	$0.21	USD	Annual
Basic (in dollars per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare`	-	USD	Annual
Basic (in dollars per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare`	$-0.12	USD	Annual
Diluted (in dollars per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare`	-	USD	Annual
Diluted (in dollars per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare`	$0.21	USD	Annual
Diluted (in dollars per share)	`DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare`	$-0.12	USD	Annual
Basic (in dollars per share)	`EarningsPerShareBasic`	$2.56	USD	Annual
Basic (in dollars per share)	`EarningsPerShareBasic`	$2.51	USD	Annual
Basic (in dollars per share)	`EarningsPerShareBasic`	$2.07	USD	Annual
Diluted (in dollars per share)	`EarningsPerShareDiluted`	$2.07	USD	Annual
Diluted (in dollars per share)	`EarningsPerShareDiluted`	$2.56	USD	Annual
Diluted (in dollars per share)	`EarningsPerShareDiluted`	$2.51	USD	Annual
Utilities Operating Expense, Taxes	`UtilitiesOperatingExpenseTaxes`	$30.32M	USD	Annual
Utilities Operating Expense, Taxes	`UtilitiesOperatingExpenseTaxes`	$34.74M	USD	Annual
Utilities Operating Expense, Taxes	`UtilitiesOperatingExpenseTaxes`	$30.29M	USD	Annual

Cash Flow Statement 143 line items

Line Item	Tag	Value	Unit	Period
Net income	`NetIncomeLoss`	$78.67M	USD	Annual
Net income	`NetIncomeLoss`	$76.78M	USD	Annual
Net income	`NetIncomeLoss`	$61.73M	USD	Annual
Depreciation and amortization	`DepreciationAndAmortization`	$91.50M	USD	Annual
Depreciation and amortization	`DepreciationAndAmortization`	$103.68M	USD	Annual
Depreciation and amortization	`DepreciationAndAmortization`	$113.53M	USD	Annual
Regulatory amortization of gas reserves	`AmortizationOfRegulatoryAsset`	$17.78M	USD	Annual
Regulatory amortization of gas reserves	`AmortizationOfRegulatoryAsset`	$19.17M	USD	Annual
Regulatory amortization of gas reserves	`AmortizationOfRegulatoryAsset`	$13.90M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$14.62M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$18.67M	USD	Annual
Deferred income taxes	`DeferredIncomeTaxesAndTaxCredits`	$6.32M	USD	Annual
Qualified defined benefit pension plan expense	`PensionExpense`	$16.50M	USD	Annual
Qualified defined benefit pension plan expense	`PensionExpense`	$18.37M	USD	Annual
Qualified defined benefit pension plan expense	`PensionExpense`	$16.56M	USD	Annual
Contributions to qualified defined benefit pension plans	`PensionContributions`	$28.98M	USD	Annual
Contributions to qualified defined benefit pension plans	`PensionContributions`	$9.59M	USD	Annual
Contributions to qualified defined benefit pension plans	`PensionContributions`	$10.97M	USD	Annual
Deferred environmental expenditures, net	`OtherIncreaseDecreaseInEnvironmentalLiabilities`	$-27.87M	USD	Annual
Deferred environmental expenditures, net	`OtherIncreaseDecreaseInEnvironmentalLiabilities`	$-16.23M	USD	Annual
Deferred environmental expenditures, net	`OtherIncreaseDecreaseInEnvironmentalLiabilities`	$-18.19M	USD	Annual
Environmental remediation expense	`EnvironmentalRemediationExpense`	$12.34M	USD	Annual
Environmental remediation expense	`EnvironmentalRemediationExpense`	$9.94M	USD	Annual
Environmental remediation expense	`EnvironmentalRemediationExpense`	$9.69M	USD	Annual
Regulatory disallowance of pension costs	`PensionExpenseReversalOfExpenseNoncash`	$10.50M	USD	Annual
Regulatory disallowance of pension costs	`PensionExpenseReversalOfExpenseNoncash`	-	USD	Annual
Regulatory disallowance of pension costs	`PensionExpenseReversalOfExpenseNoncash`	-	USD	Annual
Gain on sale of discontinued operations, net of tax	`DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax`	-	USD	Annual
Gain on sale of discontinued operations, net of tax	`DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax`	$5.90M	USD	Annual
Gain on sale of discontinued operations, net of tax	`DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax`	-	USD	Annual
Other	`OtherNoncashIncomeExpense`	$6.94M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$-11.57M	USD	Annual
Other	`OtherNoncashIncomeExpense`	$-14.76M	USD	Annual
Receivables, net	`IncreaseDecreaseInAccountsAndOtherReceivables`	$44.13M	USD	Annual
Receivables, net	`IncreaseDecreaseInAccountsAndOtherReceivables`	$16.80M	USD	Annual
Receivables, net	`IncreaseDecreaseInAccountsAndOtherReceivables`	$-5.84M	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$5.97M	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$-1.26M	USD	Annual
Inventories	`IncreaseDecreaseInInventories`	$14.57M	USD	Annual
Income and other taxes	`IncreaseDecreaseInAccruedTaxesPayable`	$4.53M	USD	Annual
Income and other taxes	`IncreaseDecreaseInAccruedTaxesPayable`	$3.29M	USD	Annual
Income and other taxes	`IncreaseDecreaseInAccruedTaxesPayable`	$-10.71M	USD	Annual
Accounts payable	`IncreaseDecreaseInAccountsPayable`	$12.12M	USD	Annual
Accounts payable	`IncreaseDecreaseInAccountsPayable`	$-16.48M	USD	Annual
Accounts payable	`IncreaseDecreaseInAccountsPayable`	$-15.91M	USD	Annual
Deferred gas costs	`IncreaseDecreaseInDeferredGasCost`	$40.54M	USD	Annual
Deferred gas costs	`IncreaseDecreaseInDeferredGasCost`	$23.47M	USD	Annual
Deferred gas costs	`IncreaseDecreaseInDeferredGasCost`	$-17.59M	USD	Annual
Decoupling mechanism	`IncreaseDecreaseInRegulatoryAssetsAndLiabilities`	$-44.46M	USD	Annual
Decoupling mechanism	`IncreaseDecreaseInRegulatoryAssetsAndLiabilities`	$-655.00K	USD	Annual
Decoupling mechanism	`IncreaseDecreaseInRegulatoryAssetsAndLiabilities`	$7.24M	USD	Annual
Other, net	`IncreaseDecreaseInOtherOperatingCapitalNet`	$4.08M	USD	Annual
Other, net	`IncreaseDecreaseInOtherOperatingCapitalNet`	$2.92M	USD	Annual
Other, net	`IncreaseDecreaseInOtherOperatingCapitalNet`	$26.07M	USD	Annual
Discontinued operations	`CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations`	-	USD	Annual
Discontinued operations	`CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations`	$712.00K	USD	Annual
Discontinued operations	`CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations`	$1.89M	USD	Annual
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$186.01M	USD	Annual
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$160.35M	USD	Annual
Cash provided by operating activities	`NetCashProvidedByUsedInOperatingActivities`	$145.32M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$273.02M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$293.89M	USD	Annual
Capital expenditures	`PaymentsToAcquirePropertyPlantAndEquipment`	$223.47M	USD	Annual
Acquisitions, net of cash acquired	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$56.79M	USD	Annual
Acquisitions, net of cash acquired	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$38.26M	USD	Annual
Acquisitions, net of cash acquired	`PaymentsToAcquireBusinessesNetOfCashAcquired`	$1.29M	USD	Annual
Leasehold improvement expenditures	`OperatingLeasePaymentsUse`	$18.81M	USD	Annual
Leasehold improvement expenditures	`OperatingLeasePaymentsUse`	$1.36M	USD	Annual
Leasehold improvement expenditures	`OperatingLeasePaymentsUse`	$7.88M	USD	Annual
Proceeds from the sale of assets	`ProceedsFromSaleOfLandHeldForUse`	$659.00K	USD	Annual
Proceeds from the sale of assets	`ProceedsFromSaleOfLandHeldForUse`	$3.93M	USD	Annual
Proceeds from the sale of assets	`ProceedsFromSaleOfLandHeldForUse`	$8.15M	USD	Annual
Payments to Acquire Equity Method Investments	`PaymentsToAcquireEquityMethodInvestments`	$14.45M	USD	Annual
Payments to Acquire Equity Method Investments	`PaymentsToAcquireEquityMethodInvestments`	-	USD	Annual
Payments to Acquire Equity Method Investments	`PaymentsToAcquireEquityMethodInvestments`	-	USD	Annual
Proceeds from Sale of Equity Method Investments	`ProceedsFromSaleOfEquityMethodInvestments`	$7.00M	USD	Annual
Proceeds from Sale of Equity Method Investments	`ProceedsFromSaleOfEquityMethodInvestments`	$7.00M	USD	Annual
Proceeds from Sale of Equity Method Investments	`ProceedsFromSaleOfEquityMethodInvestments`	-	USD	Annual
Proceeds from sale of discontinued operations	`ProceedsFromDivestitureOfBusinesses`	-	USD	Annual
Proceeds from sale of discontinued operations	`ProceedsFromDivestitureOfBusinesses`	-	USD	Annual
Proceeds from sale of discontinued operations	`ProceedsFromDivestitureOfBusinesses`	$12.50M	USD	Annual
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$54.00K	USD	Annual
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$-1.65M	USD	Annual
Other	`PaymentsForProceedsFromOtherInvestingActivities`	$3.54M	USD	Annual
Discontinued operations	`CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations`	$-1.83M	USD	Annual
Discontinued operations	`CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations`	$-4.42M	USD	Annual
Discontinued operations	`CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations`	-	USD	Annual
Cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-300.12M	USD	Annual
Cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-294.28M	USD	Annual
Cash used in investing activities	`NetCashProvidedByUsedInInvestingActivities`	$-303.78M	USD	Annual
Proceeds from common stock issued, net	`ProceedsFromIssuanceOfCommonStock`	-	USD	Annual
Proceeds from common stock issued, net	`ProceedsFromIssuanceOfCommonStock`	$17.50M	USD	Annual
Proceeds from common stock issued, net	`ProceedsFromIssuanceOfCommonStock`	$92.96M	USD	Annual
Long-term debt issued	`ProceedsFromIssuanceOfLongTermDebt`	$185.00M	USD	Annual
Long-term debt issued	`ProceedsFromIssuanceOfLongTermDebt`	$175.00M	USD	Annual
Long-term debt issued	`ProceedsFromIssuanceOfLongTermDebt`	$150.00M	USD	Annual
Long-term debt retired	`RepaymentsOfLongTermDebt`	$30.00M	USD	Annual
Long-term debt retired	`RepaymentsOfLongTermDebt`	$75.00M	USD	Annual
Long-term debt retired	`RepaymentsOfLongTermDebt`	$95.00M	USD	Annual
Repayments of Short-term Debt	`RepaymentsOfDebtMaturingInMoreThanThreeMonths`	$150.00M	USD	Annual
Repayments of Short-term Debt	`RepaymentsOfDebtMaturingInMoreThanThreeMonths`	$100.00M	USD	Annual
Repayments of Short-term Debt	`RepaymentsOfDebtMaturingInMoreThanThreeMonths`	-	USD	Annual
Proceeds from issuances of commercial paper, maturities greater than 90 days	`ProceedsFromIssuancesOfCommercialPaperMaturitiesGreaterThan90Days`	-	USD	Annual
Proceeds from issuances of commercial paper, maturities greater than 90 days	`ProceedsFromIssuancesOfCommercialPaperMaturitiesGreaterThan90Days`	$195.03M	USD	Annual
Proceeds from issuances of commercial paper, maturities greater than 90 days	`ProceedsFromIssuancesOfCommercialPaperMaturitiesGreaterThan90Days`	-	USD	Annual
Repayments of commercial paper, maturities greater than three months	`RepaymentsOfCommercialPaperMaturitiesGreaterThanThreeMonths`	-	USD	Annual
Repayments of commercial paper, maturities greater than three months	`RepaymentsOfCommercialPaperMaturitiesGreaterThanThreeMonths`	-	USD	Annual
Repayments of commercial paper, maturities greater than three months	`RepaymentsOfCommercialPaperMaturitiesGreaterThanThreeMonths`	$-195.03M	USD	Annual
Changes in other short-term debt, net	`ProceedsFromRepaymentsOfShortTermDebt`	$-68.52M	USD	Annual
Changes in other short-term debt, net	`ProceedsFromRepaymentsOfShortTermDebt`	$280.00M	USD	Annual
Changes in other short-term debt, net	`ProceedsFromRepaymentsOfShortTermDebt`	$-39.60M	USD	Annual
Cash dividend payments on common stock	`PaymentsOfDividendsCommonStock`	$55.42M	USD	Annual
Cash dividend payments on common stock	`PaymentsOfDividendsCommonStock`	$53.34M	USD	Annual
Cash dividend payments on common stock	`PaymentsOfDividendsCommonStock`	$55.92M	USD	Annual
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$-599.00K	USD	Annual
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$-3.23M	USD	Annual
Other	`ProceedsFromPaymentsForOtherFinancingActivities`	$-5.12M	USD	Annual
Cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$131.44M	USD	Annual
Cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$171.78M	USD	Annual
Cash provided by financing activities	`NetCashProvidedByUsedInFinancingActivities`	$115.50M	USD	Annual
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$22.82M	USD	Annual
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$-8.33M	USD	Annual
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseExcludingExchangeRateEffect`	$-2.27M	USD	Annual
Cash, cash equivalents and restricted cash, beginning of period	`CashAndCashEquivalentsAtCarryingValue`	$30.17M	USD	Point-in-time
Cash, cash equivalents and restricted cash, beginning of period	`CashAndCashEquivalentsAtCarryingValue`	$18.56M	USD	Point-in-time
Cash, cash equivalents and restricted cash, end of period	`CashAndCashEquivalentsAtCarryingValue`	$30.17M	USD	Point-in-time
Cash, cash equivalents and restricted cash, end of period	`CashAndCashEquivalentsAtCarryingValue`	$18.56M	USD	Point-in-time
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$27.12M	USD	Point-in-time
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$35.45M	USD	Point-in-time
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$12.64M	USD	Point-in-time
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	`CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents`	$14.91M	USD	Point-in-time
Interest paid, net of capitalization	`InterestPaidNet`	$43.72M	USD	Annual
Interest paid, net of capitalization	`InterestPaidNet`	$42.65M	USD	Annual
Interest paid, net of capitalization	`InterestPaidNet`	$41.23M	USD	Annual
Income taxes paid (refunded)	`IncomeTaxesPaidNet`	$10.55M	USD	Annual
Income taxes paid (refunded)	`IncomeTaxesPaidNet`	$-96.00K	USD	Annual
Income taxes paid (refunded)	`IncomeTaxesPaidNet`	$13.64M	USD	Annual
Proceeds from Debt, Maturing in More than Three Months	`ProceedsFromDebtMaturingInMoreThanThreeMonths`	-	USD	Annual
Proceeds from Debt, Maturing in More than Three Months	`ProceedsFromDebtMaturingInMoreThanThreeMonths`	$150.00M	USD	Annual
Proceeds from Debt, Maturing in More than Three Months	`ProceedsFromDebtMaturingInMoreThanThreeMonths`	$100.00M	USD	Annual
Change In Decoupling Regulatory Deferral	`ChangeInDecouplingRegulatoryDeferral`	$5.21M	USD	Annual
Change In Decoupling Regulatory Deferral	`ChangeInDecouplingRegulatoryDeferral`	$-18.66M	USD	Annual
Change In Decoupling Regulatory Deferral	`ChangeInDecouplingRegulatoryDeferral`	$-2.88M	USD	Annual

Stockholders Equity 26 line items

Line Item	Tag	Value	Unit	Period
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$935.15M	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$888.73M	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$762.63M	USD	Point-in-time
Beginning Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$866.00M	USD	Point-in-time
Comprehensive income (loss)	`ComprehensiveIncomeNetOfTax`	$74.61M	USD	Annual
Comprehensive income (loss)	`ComprehensiveIncomeNetOfTax`	$59.56M	USD	Annual
Comprehensive income (loss)	`ComprehensiveIncomeNetOfTax`	$80.16M	USD	Annual
Dividends on common stock	`DividendsCommonStockCash`	$58.71M	USD	Annual
Dividends on common stock	`DividendsCommonStockCash`	$56.83M	USD	Annual
Dividends on common stock	`DividendsCommonStockCash`	$59.41M	USD	Annual
Stock-based compensation	`StockGrantedDuringPeriodValueSharebasedCompensation`	$3.62M	USD	Annual
Stock-based compensation	`StockGrantedDuringPeriodValueSharebasedCompensation`	$4.36M	USD	Annual
Shares issued pursuant to equity based plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$4.54M	USD	Annual
Shares issued pursuant to equity based plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$2.47M	USD	Annual
Shares issued pursuant to equity based plans	`StockIssuedDuringPeriodValueShareBasedCompensation`	$2.60M	USD	Annual
Issuance of common stock, net of issuance costs	`StockIssuedDuringPeriodValueNewIssues`	$17.50M	USD	Annual
Issuance of common stock, net of issuance costs	`StockIssuedDuringPeriodValueNewIssues`	$92.96M	USD	Annual
Shares issued pursuant to equity based plans	`StockRepurchasedDuringPeriodValue`	$5.08M	USD	Annual
Reclassification of tax effects from the TCJA	`BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable`	-	USD	Annual
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$935.15M	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$888.73M	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$762.63M	USD	Point-in-time
Ending Balance	`StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest`	$866.00M	USD	Point-in-time
Dividends on common stock (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$1.92	USD	Annual
Dividends on common stock (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$1.90	USD	Annual
Dividends on common stock (in dollars per share)	`CommonStockDividendsPerShareCashPaid`	$1.91	USD	Annual

Data is extracted from SEC EDGAR XBRL filings. Values shown are as reported in the filing.